Alright, let's work through 25026749 times 21487173 step by step
25026749 × 21487173 = 21487173 × (25026749)
+ 21487173 × 9 what gives us 193384557
+ 21487173 × 40 resulting in 859486920
+ 21487173 × 700 producing 15041021100
+ 21487173 × 6000 yielding 128923038000
+ 21487173 × 20000 that equals 429743460000
+ 21487173 × 000000 that equals 0
+ 21487173 × 5000000 yielding 107435865000000
+ 21487173 × 20000000 that results in 429743460000000

= 537754085390577
